WATER CRISIS CONTEXT: Rajasthan covers 10.41% of India's area but has only 1.16% of India's total surface water resources. The state receives average annual rainfall of just 57.51 cm (national average: 118 cm). Nearly 60% of the state is desert/semi-arid with rainfall below 40 cm. This extreme water deficit makes irrigation the single most critical factor for Rajasthan's agriculture and economy. Only about 35% of cultivated area is irrigated — the rest depends entirely on rainfall.

INDIRA GANDHI NAHAR PARIYOJANA (IGNP) / RAJASTHAN CANAL: The WORLD'S LONGEST CANAL PROJECT. Originally called 'Rajasthan Canal' — renamed INDIRA GANDHI CANAL on 2 NOVEMBER 1984 (after PM Indira Gandhi's assassination). Brings water from the SUTLEJ and BEAS rivers through HARIKE BARRAGE (Punjab, at the confluence of Sutlej and Beas). Conceived by engineer KANWAR SAIN. Foundation stone laid by then Home Minister Govind Ballabh Pant (31 March 1958). PHASE I (Rajasthan Feeder + Main Canal): From Harike Barrage to Masitawali (Hanumangarh). Length: 204 km. This section is FULLY LINED (concrete-lined to prevent seepage). Completed in the 1960s-70s. PHASE II (Main Canal + Distribution): From Suratgarh/Mohangarh onward to Barmer. Length: 256 km. This section is UNLINED. Still being extended. Total system includes 9,060 km of distribution channels. SEVEN DISTRICTS benefited: Ganganagar, Hanumangarh, Bikaner, Churu, Jodhpur, Jaisalmer, Barmer. IMPACT: Transformed desert wasteland into productive farmland. Ganganagar became 'Food Basket of Rajasthan' (wheat, cotton, rice, mustard). Created the Thar Green Belt. But also caused problems: waterlogging (uthaan), salinization of soil, rise of water table in some areas.

EASTERN RAJASTHAN CANAL PROJECT (ERCP): Announced in Rajasthan Budget 2017-18. The most ambitious water transfer project in Rajasthan's recent history. CONCEPT: During monsoon season, southern Rajasthan's rivers (Chambal basin) have SURPLUS water that flows into the sea. ERCP captures this surplus and transfers it to water-DEFICIT eastern and south-eastern Rajasthan. This is an INTRA-STATE water transfer (unlike IGNP which is inter-state). KEY STRUCTURES: Navnera Barrage (on Chambal, Kota), Ramgarh Dam (on Kalisindh, Baran), and multiple link canals. Coverage: 23.67% of state area, benefits 41.13% of population across 13 districts. Addresses drinking water needs of Jaipur city (Bisalpur Dam connected to ERCP). Also provides irrigation for eastern Rajasthan's agricultural belt. NARMADA CANAL PROJECT: Brings Narmada river water from Gujarat's SARDAR SAROVAR DAM to southern and western Rajasthan — Jalore, Barmer, Sirohi, Pali districts. Rajasthan's share: 0.5 MAF (million acre feet). Provides drinking water and irrigation to arid southern districts.

MAJOR DAMS AND BARRAGES (dam↔river↔district matching — tested frequently): CHAMBAL SYSTEM: Gandhi Sagar Dam (Chambal, MP), Rana Pratap Sagar Dam (Chambal, Rawatbhata/Chittorgarh — Rajasthan's LARGEST hydroelectric project + Rajasthan Atomic Power Station nearby), Jawahar Sagar Dam (Chambal, Kota), Kota Barrage (for irrigation distribution). BANAS SYSTEM: Bisalpur Dam (Banas, Tonk — Jaipur's primary drinking water source), Morel Dam (Jaipur), Meja Dam (Berach/Bhilwara), Isarda Dam (Banas, Sawai Madhopur). LUNI SYSTEM: Jawai Dam (Sukri tributary, Pali — 'Amrit Sarovar of Marwar', largest dam of western Rajasthan, also famous for Jawai Leopard Safari). MAHI SYSTEM: Mahi Bajaj Sagar (Mahi, Banswara — largest dam of southern Rajasthan), Jakham Dam (Jakham, Pratapgarh — HIGHEST dam in Rajasthan at 81 metres), Kadana Dam (Gujarat, on Mahi). OTHER: Ramgarh Dam (Banganga, Jaipur), Jaisamand/Dhebar (Gomti, Udaipur), Rajsamand (Gomti, Rajsamand).

TRADITIONAL WATER HARVESTING SYSTEMS (unique to Rajasthan's arid culture): JOHADS — Small earthen check dams that capture rainwater runoff and allow it to percolate into the ground, recharging aquifers. Revived by RAJENDRA SINGH (Ramon Magsaysay Award 2001, called 'WATER MAN OF INDIA') in ALWAR district through the Tarun Bharat Sangh organization. His work restored water tables across 1,000+ villages in Alwar. TANKAS — Underground cylindrical cisterns (usually 3-4 metres diameter, 4-6 metres deep) built of lime plaster to store rainwater. Found in every household in Bikaner and Jaisalmer. Rooftop catchment channels direct rainwater into tankas. The stored water remains cool and potable for months. KUNDS/KUNDIS — Similar to tankas but with a larger saucer-shaped catchment area on the ground surface directing rainfall into the underground storage. Common in Barmer-Jaisalmer. JHALARA — Rectangular stepwells used primarily for community bathing and religious rituals (NOT for drinking water). Multiple levels of steps on all four sides. Jodhpur has several famous jhalaras. BAORIS/VAVS/STEPWELLS — Architectural marvels combining water access with aesthetic design. CHAND BAORI (Abhaneri, Dausa) — one of the DEEPEST stepwells in the world with approximately 3,500 STEPS and 13 stories. Built in the 8th-9th century by Raja Chanda of the Nikumbha dynasty. Featured in films (The Dark Knight Rises). NAADI — Village pond/tank for community water and livestock use. Every village traditionally had at least one naadi. KHADIN/DHORA — Ingenious desert agriculture system: low earthen bunds (embankments) between sand dunes capture rainwater runoff, which saturates the soil behind the bund. After the water evaporates/percolates, RABI CROPS are grown in the moisture-rich soil without any irrigation. Practiced by the PALIWAL BRAHMINS of Jaisalmer (who mysteriously abandoned Kuldhara village in 1825). Khadins are found in Jaisalmer and Barmer.

REET EXAM TIPS (10 questions): (1) IGNP facts: Harike Barrage=Sutlej+Beas confluence, renamed 2 Nov 1984, Phase I=lined/204km/Masitawali, Phase II=unlined/256km, 7 districts, Kanwar Sain conceived. (2) DAM↔RIVER↔DISTRICT matching: Bisalpur=Banas=Tonk, Jawai=Sukri=Pali, Rana Pratap Sagar=Chambal=Chittorgarh, Jakham=highest=81m=Pratapgarh, Mahi Bajaj Sagar=Mahi=Banswara. (3) Traditional systems: Johads=earthen dams=Rajendra Singh=Alwar, Tankas=cylindrical cisterns=Bikaner/Jaisalmer, Chand Baori=Abhaneri=Dausa=3500 steps, Khadin=desert agriculture between dunes. TRAPS: 'IGNP was always called Indira Gandhi Canal' — FALSE (originally Rajasthan Canal, renamed 1984). 'Phase I is unlined' — FALSE (Phase I is lined, Phase II is unlined). 'ERCP transfers water from northern rivers' — FALSE (from southern Chambal basin). 'Chand Baori is in Jaipur' — FALSE (Dausa district).